WntはLRP6シグナルソームを誘導し,乱雑依存のLRP6のリン酸化を促進する
Josipa Bilic1, Ya-Lin Huang, Gary Davidson
1Division of Molecular Embryology, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
まとめ
Wnt信号はLRP6の集積とリン酸化を誘発し,シグナルソームを形成する. このプロセスは,細胞発育と癌におけるβ-カテニンの安定化などの下流イベントに不可欠です.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学について
背景:
- Wntシグナル伝達は,発達,幹細胞,がんにとって極めて重要です.
- Wnt受容体活性化の正確なメカニズムは不明である.
研究 の 目的:
- プラズマ膜でのWntシグナル発信のメカニズムを解明する.
- Wnt経路の活性化におけるLRP6結合の役割を調査する.
主な方法:
- 脊椎動物細胞のライブイメージング.
- LRP6複合体の生化学分析.
- 経路における重要なタンパク質として,Dishevelled (Dvl) を利用する.
主要な成果:
- Wnt処理は,プラズマ膜関連LRP6集積を素早く誘導する.
- リン酸化LRP6集積は,Wnt経路の成分を含むリボソームサイズの複合体を形成する.
- LRP6のリン酸化と集積には,分解 (Dvl) が必要です.
結論:
- Wntsは受容体を誘導し,DvlはLRP6-シグナルソームにコクラスタリングする.
- これらのシグナルゾームはLRP6のリン酸化を誘発し,アキシンの徴募とβ-カテニンの安定化を促します.
- これは,Wnt信号の開始に関する新しいメカニズム的な洞察を提供します.
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